/**
 * Back to Top Button - Modern & Smooth
 *
 * Pozisyon: Sol alt köşe (AI robot sağda olduğu için)
 * Görünüm: Scroll > 300px sonra fade-in
 * Animasyon: Smooth scroll to top
 *
 * @version 1.0.0
 */

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 80px; /* Mobile bottom bar üzerinde */
    left: 20px; /* SOL ALT KÖŞE - AI robot sağda */
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(100px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999; /* AI chat altında (1000) */
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

/* Dark mode support */
.dark .back-to-top {
    background: linear-gradient(135deg, #4c63d2 0%, #5a3d8f 100%);
    box-shadow: 0 4px 12px rgba(76, 99, 210, 0.5);
}

/* Visible state (scroll > 300px) */
.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Hover effect */
.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.6);
}

.dark .back-to-top:hover {
    box-shadow: 0 8px 20px rgba(76, 99, 210, 0.7);
}

/* Active (click) effect */
.back-to-top:active {
    transform: translateY(-2px);
}

/* Icon */
.back-to-top i {
    font-size: 20px;
    transition: transform 0.2s ease;
}

.back-to-top:hover i {
    transform: translateY(-3px);
}

/* Pulse animation (optional - ilk yüklemede dikkat çeker) */
@keyframes pulse-gentle {
    0%, 100% {
        box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    }
    50% {
        box-shadow: 0 4px 20px rgba(102, 126, 234, 0.8);
    }
}

.back-to-top.pulse {
    animation: pulse-gentle 2s infinite;
}

/* Mobil responsive */
@media (max-width: 768px) {
    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 70px; /* Mobile bar için space */
        left: 15px;
    }

    .back-to-top i {
        font-size: 18px;
    }
}

/* Desktop large screens */
@media (min-width: 1920px) {
    .back-to-top {
        width: 55px;
        height: 55px;
        left: 30px;
    }

    .back-to-top i {
        font-size: 22px;
    }
}